I interpreted the ending as yeonho dying once he goes to meet jaeha (what was his name again?) 10 years later doing so in the same manner that Jaeha does initially. The ending is a bad one but i just like to believe in fate and one of them was fated to die in my head. I really like the concept of this story and about finding the untinkered (?) attic in the room although I find it hard to believe that jaeha’s mom wouldn’t have known about it. I want to see more stories use this type of concept and expand on it since this author couldn’t since they were a busy student at the time.
Back in Time to You